Dual sided tape attachment to cathode electrode of radiation detector

Abstract

A cathode conductive strip can be attached to a semiconductor radiation sensor by using a double sided dual adhesive electrically conductive tape in a sensor assembly or a detector module to provide reliable electrical connection between the semiconductor radiation sensor and the cathode conductive strip. The double sided dual adhesive electrically conductive tape includes an electrically conductive backing with two different adhesion strength adhesives on both sides. The high adhesion strength side is bonded to the cathode electrode of the semiconductor radiation sensor. The lower adhesion strength side is bonded to the conductive face of the cathode conductive strip.

The invention claimed is: 
     
       1. A method of making a radiation detector system, comprising:
 providing a double sided dual adhesive electrically conductive tape including an electrically conductive high adhesion strength adhesive layer on one side and an electrically conductive low adhesion strength adhesive layer having a lower peel strength than the electrically conductive high adhesion strength adhesive layer on another side; 
 attaching the electrically conductive high adhesion strength adhesive layer to a surface of a cathode electrode of a radiation sensor; and 
 attaching the electrically conductive low adhesion strength adhesive layer to a conductive layer of a cathode conductive strip. 
 
     
     
       2. The method of  claim 1 , wherein the double sided dual adhesive electrically conductive tape comprises an electrically conductive backing layer located between the electrically conductive high adhesion strength adhesive layer and the electrically conductive low adhesion strength adhesive layer. 
     
     
       3. The method of  claim 2 , wherein the electrically conductive backing layer comprises a flexible woven conductive material. 
     
     
       4. The method of  claim 1 , wherein:
 the electrically conductive low adhesion strength adhesive layer provides post-settlement adhesion to the cathode conductive strip in a range from 0.5 N/cm to 2.5 N/cm; and 
 the electrically conductive high adhesion strength adhesive layer provides post-settlement adhesion to the cathode electrode in a range from 3.5 N/cm to 30 N/cm. 
 
     
     
       5. The method of  claim 1 , wherein the radiation sensor comprises:
 a semiconductor substrate comprising cadmium zinc telluride; 
 a pixelated anode electrode located on a first side of the semiconductor substrate; and 
 a continuous, segmented, or pixelated cathode electrode located on a second side of the semiconductor substrate. 
 
     
     
       6. The method of  claim 5 , further comprising connecting a printed circuit board carrier including at least one of electrical, mechanical, or thermal control components to the anode electrode. 
     
     
       7. The method of  claim 1 , further comprising providing an electrical connection between the cathode conductive strip and a voltage supply source. 
     
     
       8. The method of  claim 1 , wherein the cathode conductive strip further comprises a backing insulator layer that is attached to the conductive layer which comprises a metal conductive layer. 
     
     
       9. The method of  claim 8 , wherein the metal conductive layer comprises a configuration selected from:
 a first configuration in which one or more points of the metal conductive layer protrude from embedded conductive traces located within the backing insulator layer; 
 a second configuration in which one or more conductive traces are located over a planar surface of the backing insulator layer; and 
 a third configuration in which the metal conductive layer is a continuous metal film that covers an entire area of the backing insulator layer. 
 
     
     
       10. The method of  claim 1 , wherein cathode conductive strip consists of a flexible metal strip. 
     
     
       11. The method of  claim 1 , further comprising:
 providing additional double sided dual adhesive electrically conductive tapes, wherein each of the additional double sided dual adhesive electrically conductive tapes includes a respective electrically conductive high adhesion strength adhesive layer on one side and a respective electrically conductive low adhesion strength adhesive layer on another side; 
 providing additional radiation sensors; 
 attaching each electrically conductive high adhesion strength adhesive layer of the additional double sided dual adhesive electrically conductive tapes to a surface of a cathode electrode of a respective one of the additional radiation sensors; 
 attaching each electrically conductive low adhesion strength adhesive layer of the additional double sided dual adhesive electrically conductive tapes to the conductive layer of the cathode conductive strip. 
 
     
     
       12. The method of  claim 11 , further comprising:
 detaching one of the double sided dual adhesive electrically conductive tape and the additional double sided dual adhesive electrically conductive tapes from the metal conductive layer of the cathode conductive strip; 
 testing a radiation sensor attached to the detached one of the double sided dual adhesive electrically conductive tape and the additional double sided dual adhesive electrically conductive tapes; 
 re-attaching the detached one of the double sided dual adhesive electrically conductive tape and the additional double sided dual adhesive electrically conductive tapes to the metal conductive layer of the cathode conductive strip if the tested radiation sensor is functional; and 
 attaching a combination of a new radiation sensor and a new double sided dual adhesive electrically conductive tape to the metal conductive layer of the cathode conductive strip if the tested radiation sensor is not functional. 
 
     
     
       13. A radiation detector system, comprising:
 a double sided dual adhesive electrically conductive tape including an electrically conductive high adhesion strength adhesive layer on one side and an electrically conductive low adhesion strength adhesive layer having a lesser peel strength than the electrically conductive high adhesion strength adhesive layer on another side; 
 a radiation sensor including a cathode electrode, wherein the electrically conductive high adhesion strength adhesive layer is attached to a surface of the cathode electrode; and 
 a cathode conductive strip including a conductive layer, wherein the electrically conductive low adhesion strength adhesive layer is attached to the conductive layer. 
 
     
     
       14. The radiation detector system of  claim 13 , wherein the double sided dual adhesive electrically conductive tape comprises an electrically conductive backing layer located between the electrically conductive high adhesion strength adhesive layer and the electrically conductive low adhesion strength adhesive layer. 
     
     
       15. The radiation detector system of  claim 14 , wherein the electrically conductive backing layer comprises a flexible woven conductive material. 
     
     
       16. The radiation detector system of  claim 13 , wherein:
 the electrically conductive low adhesion strength adhesive layer provides post-settlement adhesion to the cathode conductive strip in a range from 0.5 N/cm to 2.5 N/cm; and 
 the electrically conductive high adhesion strength adhesive layer provides post-settlement adhesion to the cathode electrode in a range from 3.5 N/cm to 30 N/cm. 
 
     
     
       17. The radiation detector system of  claim 13 , wherein the radiation sensor comprises:
 a semiconductor substrate comprising cadmium zinc telluride; 
 a pixelated anode electrode located on a first side of the semiconductor substrate; and 
 a continuous, segmented, or pixelated cathode electrode located on a second side of the semiconductor substrate. 
 
     
     
       18. The radiation detector system of  claim 17 , wherein a printed circuit board carrier including at least one of electrical, mechanical, or thermal control components is connected to the anode electrode. 
     
     
       19. The radiation detector system of  claim 13 , wherein the cathode conductive strip is electrically connected to a voltage supply source. 
     
     
       20. The radiation detector system of  claim 13 , wherein the cathode conductive strip further comprises a backing insulator layer that is attached to the conductive layer which comprises a metal conductive layer. 
     
     
       21. The radiation detector system of  claim 13 , wherein cathode conductive strip consists of a flexible metal strip. 
     
     
       22. The radiation detector system of  claim 13 , further comprising:
 additional double sided dual adhesive electrically conductive tapes, wherein each of the additional double sided dual adhesive electrically conductive tapes includes a respective electrically conductive high adhesion strength adhesive layer on one side and a respective electrically conductive low adhesion strength adhesive layer on another side; and 
 additional radiation sensors, 
 
       wherein:
 each electrically conductive high adhesion strength adhesive layer of the additional double sided dual adhesive electrically conductive tapes is attached to a surface of a cathode electrode of a respective one of the additional radiation sensors; and 
 each electrically conductive low adhesion strength adhesive layer of the additional double sided dual adhesive electrically conductive tapes is attached to the metal conductive layer of the cathode conductive strip.